Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9abf4cd6ab7dea…

MALICIOUS

PDF

40.6 KB Created: 2020-09-18 23:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f3b2147cbf31ced8294e1a771f7277eb SHA-1: 7c80a1346ec149ffebb6f6db997c3e7d7619c48f SHA-256: ef9abf4cd6ab7dead2a50f2b78496752ba61ff6cf70a91003f4eb63d17a7e743
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, likely to deliver a payload or phish for credentials. The document body, though heavily obfuscated, contains the URL and text related to 'force concept inventory test answers', suggesting a lure. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=force+concept+inventory+test+answers In PDF document text
    • http://files.tindelltraining.com/uploads/1/3/1/4/131453214/xedoruwuxomukok-mijam.pdfIn PDF document text
    • http://virad.nysfcja.org/uploads/1/3/0/7/130776394/budarojakixajutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0133/8280/files/lemolafobamufulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/aptoide_older_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/pimenajilov.pdfIn PDF document text
    • https://4b15d451-3b84-4040-ae4e-4253431af1d8.filesusr.com/ugd/e32576_949530aa86d14a2f879aeb97fc770d6d.pdf?index=trueIn PDF document text
    • https://cdd6aa31-158e-446b-9125-991912cf48bf.filesusr.com/ugd/b58d21_9c2f9981edb545b48eeeff798ad5b2e6.pdf?index=trueIn PDF document text
    • https://f3c60321-1cc9-4acf-afbb-5574704b2317.filesusr.com/ugd/4cf28d_547b4ef2cc0b4f2492572563b89b3cc5.pdf?index=trueIn PDF document text
    • https://9471c1f7-a1c3-489b-96b2-99ae7d8aa5f6.filesusr.com/ugd/8e1900_b2e496ddc12749ca9d45f5211e6d6c70.pdf?index=trueIn PDF document text
    • https://4e3232b2-26d2-4b8e-b8c4-5defc0cc80d1.filesusr.com/ugd/0582e0_9da4980fe846496eb3aa43eb4d9e96ea.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/98269284251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0765/4563/files/bagowofam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8E 5104 bytes
SHA-256: 215c45ae77a8cd60cd27c5d33fc757aa6e3f7b800341a69e3864f6fe72d1c58c
font_01_sfnt_off00006d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 12120 bytes
SHA-256: da4389bb75bbb3c29f1d38cf134b374679512e44752b9a6bf3b49d96929c1801

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